The interface aims to make it as simple as possible for regular commuters to see how Opal
will affect them. But if enough people
shout me a beer
and tell me what they want to see, I'll consider implementing more.

Distances to/from City stations only roughly approximate the
magic 3.21 km
used by the official fare rules.

So depending on your route and destination, the computed fare may be based on an Opal band or MyMulti/MyBus/MyTrain ticket class that's actually cheaper or more expensive that what you need to buy.

Also,
please beware
that these fare calculations are in no way vetted or approved by Transport for NSW, and may contain faulty numbers or faulty logic.
Bug reports
are welcome.

I'm trying to enter a trip between two train stations, why is it telling me to use a bus instead?

If there's a (theoretically) faster bus connection, the
Google Directions API
used under the hood will not suggest any trains, so it can't figure out the distance between them. Try another nearby train station.

Who's behind this and why?

Can I see or use your source code?

You just saved me a hundred bucks. Can I buy you a beer?

Certainly.
PayPal
(info at contentshare dot sg), Bitcoin (
1LyJTcubFcJhkFEHwJX9E54n8YGoGZmHd6
) or even in liquid form if you're around Pyrmont/the CBD in the evenings.

Disclaimer

Opal or Not is not associated with or approved by
Transport for NSW.
Opal, the Opal logo, TravelTen, MyMulti and other trademarks referred to within this site are the property of Transport for NSW.

All fare comparisons are indicative.
Opal or Not does not assume any responsibility whatsoever for their accuracy, and consequently assumes no liability whatsoever for results obtained or loss or damage incurred as a result of application of the data. Opal or Not expressly disclaims all warranties, expressed or implied, including but not limited to implied warranties of merchantability and fitness for any particular purpose.